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LM2771

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低纹波 250mA 开关电容器降压 DC/DC 转换器

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LM2771

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Rating Catalog Iout (max) (A) 0.25 Vin (max) (V) 5.5 Vin (min) (V) 2.7 Vout (max) (V) 1.5 Vout (min) (V) 1.5 Features Adjustable current limit, Regulated Operating temperature range (°C) -30 to 110 Iq (typ) (A) 0.000045
Rating Catalog Iout (max) (A) 0.25 Vin (max) (V) 5.5 Vin (min) (V) 2.7 Vout (max) (V) 1.5 Vout (min) (V) 1.5 Features Adjustable current limit, Regulated Operating temperature range (°C) -30 to 110 Iq (typ) (A) 0.000045
WSON (DSC) 10 9 mm² (3 mm × 3 mm)
  • Low-Noise Fixed Frequency Operation
  • 1.5V Output Voltage
  • Li-Ion (3.6V) to 1.5V with 81% Efficiency
  • 1.7% Output Voltage Accuracy
  • Very Low Output Ripple: 8mV @ 250mA
  • Output Currents up to 250mA
  • 2.7V to 5.5V Input Range
  • Shutdown Disconnects Load from VIN
  • 1.1MHz Switching Frequency
  • No Inductors…Small Solution Size
  • Current Limit and Thermal Protection
  • WSON-10 Package (3mm × 3mm × 0.8mm)

All trademarks are the property of their respective owners.

  • Low-Noise Fixed Frequency Operation
  • 1.5V Output Voltage
  • Li-Ion (3.6V) to 1.5V with 81% Efficiency
  • 1.7% Output Voltage Accuracy
  • Very Low Output Ripple: 8mV @ 250mA
  • Output Currents up to 250mA
  • 2.7V to 5.5V Input Range
  • Shutdown Disconnects Load from VIN
  • 1.1MHz Switching Frequency
  • No Inductors…Small Solution Size
  • Current Limit and Thermal Protection
  • WSON-10 Package (3mm × 3mm × 0.8mm)

All trademarks are the property of their respective owners.

The LM2771 is a switched capacitor step-down regulator that produces a 1.5V output without the use of an inductor. It is capable of supplying loads up to 250mA. The LM2771 operates with an input voltage from 2.7V to 5.5V, and requires only 3 low-cost ceramic capacitors.

The LM2771 uses a regulated 0.5x charge pump to give power conversion efficiencies nearly twice as high as an LDO. Pre-regulated 1.1MHz fixed-frequency switching results in very low ripple and noise on both the input and the output. When output currents are low (<30mA typ.), the part automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the entire load range. At input voltages below 3.5V (Typ), the charge pump goes into pass mode, with efficiencies similar to an LDO.

The LM2771 is a switched capacitor step-down regulator that produces a 1.5V output without the use of an inductor. It is capable of supplying loads up to 250mA. The LM2771 operates with an input voltage from 2.7V to 5.5V, and requires only 3 low-cost ceramic capacitors.

The LM2771 uses a regulated 0.5x charge pump to give power conversion efficiencies nearly twice as high as an LDO. Pre-regulated 1.1MHz fixed-frequency switching results in very low ripple and noise on both the input and the output. When output currents are low (<30mA typ.), the part automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the entire load range. At input voltages below 3.5V (Typ), the charge pump goes into pass mode, with efficiencies similar to an LDO.
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技术文档

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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter 数据表 (Rev. A) 2013-5-1
选择指南 电源管理指南 2018 2018-7-31
技术文章 Charge pumps: An often unconsidered method of DC/DC conversion PDF | HTML 2015-7-17
技术文章 Charge pump, inductor-based converter or LDO? PDF | HTML 2015-6-19
白皮书 The Forgotten Converter 2015-6-15

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封装 引脚 CAD 符号、封装和 3D 模型
WSON (DSC) 10 Ultra Librarian
适用于评估类项目的 TI 标准条款与条件。

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